I'd love a web based editor that uses Dropbox (or your cloud based storage) for storage. I use Elements editor on the iPhone but for when I just have a browser

I'd love a web based editor that uses Dropbox (or your cloud based storage) for storage. I use Elements editor on the iPhone but for when I just have a browser... (Similarly I'd feel a lot more comfortable with Google Applications if I could tell it to store my documents on my storage, or at least seamlessly mirror to my storage)